Originally Posted by mrcheaps
Just be aware that if you do combine, you will no longer have the ability to earn promos on two accounts, only one.
Not true. I was sent a second card with a promo a few months ago and I called to confirm whether I could get the promo points and miles from the new card as well as a different promo that I was halfway through on my existing card. CS said yes, and I earned both promos on my new card number after combining the accounts.